Kabongo Guy L, Mhlongo Gugu H, Dhlamini Mokhotjwa S
Department of Physics, University of South Africa, P.O. Box 392, Pretoria 0003, South Africa.
CSIR-National Centre for Nano-Structured Materials, P.O. Box 395, Pretoria 0001, South Africa.
Nanomaterials (Basel). 2021 Oct 4;11(10):2611. doi: 10.3390/nano11102611.
This research work describes the synthesis of ZnO nanostructures doped with Ho ions using a conventional sol-gel synthesis method. The nanostructured produced exhibited a wurtzite hexagonal structure in both ZnO and ZnO:Ho (0.25, 0.5, 0.75 mol%) samples. The change in morphology with addition of Ho dopants was observed, which was assigned to Ostwald ripening effect occurring during the nanoparticles' growth. The photoluminescence emission properties of the doped samples revealed that Ho was emitting through its electronic transitions. Moreover, reduced surface defects were observed in the Holmium doped samples whose analysis was undertaken using an X-ray Photoelectron Spectroscopy (XPS) technique. Finally, enhanced room temperature ferromagnetism (RT-FM) for Ho-doped ZnO (0.5 mol%) samples with a peak-to-peak line width of 452 G was detected and found to be highly correlated to the UV-VIS transmittance results.
这项研究工作描述了采用传统溶胶-凝胶合成法合成掺钬离子的氧化锌纳米结构。所制备的纳米结构在氧化锌和氧化锌:钬（0.25、0.5、0.75摩尔%）样品中均呈现纤锌矿六方结构。观察到随着钬掺杂剂的加入形态发生了变化，这归因于纳米颗粒生长过程中发生的奥斯特瓦尔德熟化效应。掺杂样品的光致发光发射特性表明，钬通过其电子跃迁发光。此外，使用X射线光电子能谱（XPS）技术对掺钬样品进行分析时，观察到表面缺陷减少。最后，检测到掺钬氧化锌（0.5摩尔%）样品在室温下具有增强的铁磁性（RT-FM），其峰-峰线宽为452 G，并且发现与紫外-可见透射率结果高度相关。
Zotero 插件
